Skip gcc.dg/tree-ssa/isolate-*.c for AVR Target

[Jeff Law]

On 03/28/14 04:16, K_s, Vishnu wrote:
> Hi all,
>
> The tests added in gcc.dg/tree-ssa/isolate-*.c is failing for AVR target,
> Because the isolate erroneous path pass needs -fdelete-null-pointer-checks
> option to be enabled. For AVR target that option is disabled, this cause
> the tests to fail. Following Patch skip the isolate-* tests if
> "keeps_null_pointer_checks" is true.
>
> 2014-03-28  Vishnu K S <Vishnu.k_s@atmel.com >
>
> 	* gcc/testsuite/gcc.dg/tree-ssa/isolate-1.c: Skip test for AVR
> 	* gcc/testsuite/gcc.dg/tree-ssa/isolate-2.c: Ditto
> 	* gcc/testsuite/gcc.dg/tree-ssa/isolate-3.c: Ditto
> 	* gcc/testsuite/gcc.dg/tree-ssa/isolate-4.c: Ditto
> 	* gcc/testsuite/gcc.dg/tree-ssa/isolate-5.c: Ditto
This is fine for the trunk.  Please go ahead and install.

However, we generally discourage ports from turning off passes like this 
and particularly so without a comment as to why a pass is turned off.

That code was added to the AVR port here:

http://gcc.gnu.org/ml/gcc-patches/2007-03/msg01968.html


If you could add a comment to the AVR port indicating that 
delete-null-pointer-checks is disabled because the hardware does not 
fault on a NULL dereference, it would be greatly appreciated.  Consider 
that comment addition pre-approved, just post it to the list for 
archival purposes.

Thanks,
Jeff